There's probably a good half inch of play front to rear in the front driveshaft. I actually feel it's too much. How much more do you want to allow for bad landings? Not sure I would call that a weak point of the car. Although I did see a picture of a severely bent driveshaft on FB, but couldn't imagine how the heck the guy pulled that off.

I've been running tekno for almost 2 years, and crash rather spectacularly at times, and have yet to bend a driveshaft. I have had my truggy flex enough to have my rear driveshaft pop out though.